[Bug c++/36430] New: Cannot convert a temporary to a non-const reference even with conversion operator

[Bug c++/36430] New: Cannot convert a temporary to a non-const reference even with conversion operator

[gbrammer at gmx dot de]

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struct Foo {
    operator Foo & () { return *this; }
};
void frobnicate(Foo &) {
/* in reality, the Foo is changed here and returned */
}
int main () {
    frobnicate (Foo());
}

temporary.cpp:8: error: invalid initialization of non-const reference of type
‘Foo&’ from a temporary of type ‘Foo’
temporary.cpp:4: error: in passing argument 1 of ‘void frobnicate(Foo&)’

This works with g++ 4.1, but does not work with 4.2 and 4.3.


-- 
           Summary: Cannot convert a temporary to a non-const reference even
                    with conversion operator
           Product: gcc
           Version: 4.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: gbrammer at gmx dot de


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36430

[Bug c++/36430] Cannot convert a temporary to a non-const reference even with conversion operator

[gcc-bugzilla at contacts dot eelis dot net]

------- Comment #1 from gcc-bugzilla at contacts dot eelis dot net  2008-08-21 11:43 -------
This report is invalid. By 12.3.2,

  "A conversion function is never used to convert a
  (possibly cv-qualified) object to the (possibly
  cv-qualified) same object type (or a reference to it)."

Comeau warns explicitly about this, saying:

  line 2: warning: "Foo::operator Foo &()" will not be
    called for implicit or explicit conversions


-- 

gcc-bugzilla at contacts dot eelis dot net changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |gcc-bugzilla at contacts dot
                   |                            |eelis dot net


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36430

[Bug c++/36430] Cannot convert a temporary to a non-const reference even with conversion operator

[paolo dot carlini at oracle dot com]

------- Comment #2 from paolo dot carlini at oracle dot com  2008-08-21 12:04 -------


*** This bug has been marked as a duplicate of 26698 ***


-- 

paolo dot carlini at oracle dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |DUPLICATE


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36430